Holosun 507c vs 507k: Best Red Dot for Your Pistol in 2025

The Holosun 507c and Holosun 507k are top-tier red dot sights, but their differences in size, mounting footprint, and intended use make them suited for distinct purposes. The 507c is a full-size optic with a Trijicon RMR footprint, ideal for duty and competition pistols like the Glock 19 or Sig P320. The 507k is a micro-optic with a Holosun "K" series footprint, designed for concealed carry handguns like the Sig P365 or Glock 43X. This guide compares their features, performance, and compatibility to help you choose the best optic for your needs.

Quick Comparison: Holosun 507c vs 507k

Here’s a side-by-side breakdown of key specifications:

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Why Choose a Holosun Red Dot?

Holosun optics are renowned for their durability, advanced features, and value. Both the 507c and 507k offer the Multi-Reticle System (MRS), Shake Awake technology, and robust construction, making them popular among shooters. Whether you’re a competitive shooter, law enforcement officer, or concealed carry enthusiast, understanding their differences is key to selecting the right optic.

Detailed Breakdown

Size and Concealability

The Holosun 507c has a larger frame and window, making it easier to track the dot during rapid fire, which is ideal for competition or duty use. Its dimensions (1.78 x 1.15 x 1.15 inches) suit full-size or compact pistols like the Glock 17, Sig P320, or optics-ready 1911s. However, its size may add bulk for concealed carry.

The Holosun 507k is designed for concealability, with a narrower profile (1.6 x 0.98 x 0.95 inches) that aligns with the width of slimline pistols like the Sig P365 or Glock 43X. This reduces snagging and printing, making it perfect for everyday carry (EDC).

Pro Tip: Pair the 507k with a mounting plate for seamless integration with your concealed carry pistol.

Mounting Footprint

The 507c uses the Trijicon RMR footprint, the industry standard for full-size, optics-ready pistols. This makes it compatible with a wide range of handguns without adapters, such as the Glock 19 MOS or Sig P320 X-Series.

The 507k uses the Holosun "K" series footprint (a modified RMSc pattern), designed for micro-compact pistols. Many subcompact handguns, like the Springfield Hellcat or Sig P365, require this footprint. If your pistol doesn’t have a compatible cut, you’ll need an adapter plate, available at EGWGuns.

Note: Always verify your pistol’s optic cut before purchasing. Check our mounting guide below for details.

Reticle and Features

Both optics feature the Multi-Reticle System (MRS), allowing you to switch between a 2 MOA dot, a 32 MOA circle, or a circle-dot combination. This versatility suits various shooting scenarios, from precision shots to fast target acquisition.

• 507c: Includes Solar Failsafe, which extends battery life by using ambient light to power the optic. This is ideal for outdoor shooting or environments with variable lighting.
• 507k: Lacks Solar Failsafe due to its compact size but retains Shake Awake technology, which powers down the optic when not in use to conserve battery life (up to 50,000 hours).

Both are IP67 waterproof and built from durable 7075 T6 aluminum, ensuring reliability in harsh conditions.

Performance in Use

Holosun 507c: The larger window (0.63 x 0.91 inches) enhances target acquisition speed, making it a favorite for competitive shooters and law enforcement. Its robust build withstands the recoil of full-size calibers like 9mm or .45 ACP.

Holosun 507k: The smaller window (0.58 x 0.77 inches) is optimized for concealed carry, where quick draw and minimal bulk are priorities. It performs well on subcompact pistols but may require more practice to track the dot due to the smaller window.

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Compatibility with Pistols

Here’s a quick guide to compatible pistols:

Need a mounting plate? Shop our red dot mounts for seamless installation.

Installation Guide

Mounting a Holosun optic requires ensuring your pistol’s slide is optics-ready or has a compatible adapter plate. Follow these steps:

1. Verify Compatibility: Confirm your pistol’s optic cut matches the 507c (RMR) or 507k (K series) footprint.
2. Select a Mounting Plate: If needed, choose a plate from EGWGuns for your specific pistol model.
3. Install the Optic: Secure the optic with provided screws, using a torque wrench (15–20 in-lbs) to avoid over-tightening.
4. Zero the Optic: Sight in at your preferred distance (e.g., 25 yards) using the 2 MOA dot for precision.

Watch our installation video below for a step-by-step guide.

Conclusion: Which Holosun Red Dot Should You Buy?

• Choose the Holosun 507c if: You own a full-size or compact handgun (e.g., Glock 19, Sig P320, or optics-ready 1911) and prioritize a large window, Solar Failsafe, and durability for duty or competition.
• Choose the Holosun 507k if: You carry a subcompact pistol (e.g., Sig P365, Springfield Hellcat, Glock 43X) and need a compact optic for concealed carry without sacrificing features.

Ready to upgrade your pistol? Shop the Holosun 507c or Holosun 507k at EGWGuns and get free shipping on orders over $125!

Frequently Asked Questions

What’s the difference between Holosun 507c and 507k?

The 507c is a full-size optic with a Trijicon RMR footprint and Solar Failsafe, ideal for duty or competition pistols. The 507k is a micro-optic with a Holosun "K" series footprint, designed for concealed carry pistols.

Which Holosun optic is best for concealed carry?

The Holosun 507k is best for concealed carry due to its compact size and compatibility with subcompact pistols like the Sig P365 or Glock 43X.

Can I use the Holosun 507c on a Glock 43X?

The 507c requires an adapter plate for the Glock 43X, as it uses the RMR footprint. The 507k is a direct fit for the Glock 43X MOS.

How durable are the 507c and 507k?

Both are IP67 waterproof and made from 7075 T6 aluminum, ensuring durability for recoil and harsh conditions.

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